Answer:
Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.
Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.
Answer:
Single-stream recycling has two main advantages: Since it's so much easier than sorting out recyclables for individuals, it increases household recycling rates, and since it's easier to dump one can of stuff into a collection truck with one compartment, it saves cities money.
Benefits of Recycling: Reduces the amount of waste sent to landfills and incinerators. Conserves natural resources such as timber, water and minerals. Increases economic security by tapping a domestic source of materials. Prevents pollution by reducing the need to collect new raw materials. Saves energy.
Explanation:
Temperature and heat are the same thing.
Temperature measures thermal energy, and heat is the flow of thermal energy.
Temperature measures the loss of energy, and heat measures the gain of energy.
Answer: Option (c) is the correct answer.
Explanation:
Temperature is used as for measuring the average kinetic energy present in a substance or object.
The internal kinetic energy obtained by the molecules of an object is known as thermal energy.
Hence, temperature measures the thermal energy of an object.
Whereas when this thermal energy flows from a hotter object to a cooler object which are placed adjacent to each other then it is known that heat is flowing.
Thus, we can conclude that heat differ from temperature as temperature measures thermal energy, and heat is the flow of thermal energy.
Answer:
C) Temperature measures thermal energy, and heat is the flow of thermal energy.
Explanation:
just took it on edge
b. 2H2CO3
c. CO2 2H2O
B. cooled rapidly.
C. subjected to a small voltage.
D. exposed to weak light.
Answer:
A. bombarded by high-speed electrons.
Explanation:
Conductors are materials that allows current to pass through them.
However, the flow of current is actually the flow of electrons in the opposite direction.
When a conductor is bombarded by by high-speed electrons, the high speed electrons will repel the electrons in the conductor (in electromagnetism, like charges repel) thus giving them the required kinetic energy to leave the surface of the conductor.
A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Melting of wax is a physical change and chemical change is the burning of candle.
Chemical changes are those changes by which composition of the original matter changes and physical changes are those changes by which only appearance of the matter changes.
In the given activity:
Hence, Roger is correct ie. The melting wax is a physical change and the burning candle wick is a chemical change.
To know more about physical and chemical changes, visit the below link:
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Answer is: (3) 2–8–17–6.
1) This is ground state of sodum atom.
Electron configuration of sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
Atomic number of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.
2) This is ground state of sulfur atom.
Sulfur electron configuration: ₁₆S 1s²2s²2p⁶3s²3p⁴.
Sulfur has six valence electrons (3s²3p⁴), in 3s orbital, two electrons are paired, in 3p orbital, two electrons are paired and two are unpaired.
4) This is ground state of arsenic atom.
Electron configuration of arsenic atom:
₃₃As 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³.
Electron configuration represents an excited state : (3) 2–8–17–6
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Determination of electron configurations based on principles:
According to Niels Bohr, electrons surround the nucleus of an atom on a path called the electron shell. Each shell has an energy level. The further from the core, the higher the energy level
Maximum electrons of shells :
The maximum number of electrons in each shell can be formulated = 2n² (n = shell number)
Electrons can move the shell up or down by releasing energy or absorbing energy
Excited electrons show higher electron transfer to the shell by absorbing energy
So it can be concluded that there are 2 conditions :
Ground state is the state of electrons filling skins with the lowest energy levels.
Excited state is the state of electrons which occupy a higher energy level
The state of excited electrons can be seen from the presence of electrons which do not fill the skin completely but fill the skin afterwards
From the electron configuration , option 3 shows the excitation of one electron in the M shell towards the N shell, which should have a configuration in the ground state:
2–8–18–5
element X
electrons and atomic orbitals
about subatomic particles statement
Keywords: electron configurations, the shell of atoms, excited state